Why do the comb, wattle and visible parts of a 10-week-old chick’s head look purplish with the comb, wattle and related parts swollen or puffed up?

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A poultry veterinarian says:
1). The bluish/purplish coloration (cyanosis) indicates the chick is suffering from poor oxygen circulation in its blood
2). The swollen and puffed-up head and comb are signs of an underlying respiratory, environmental or systemic infection causing fluid (edema) and inflammation to build up beneath the skin
3). These symptoms point to one of a few common poultry issues:
i). Swollen Head Syndrome (SHS): A viral illness caused by the avian pneumovirus (often paired with secondary E. coli infections) that causes fluid accumulation under the eyes and surrounding tissues

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ii). Respiratory Infections: Diseases such as Infectious Coryza or Mycoplasma gallisepticum frequently result in facial swelling, foamy eyes and breathing distress which quickly leads to a bluish/purple comb
iii). Environmental Stressors: High levels of ammonia or poor ventilation in the coop irritate the respiratory tract, severely worsening these infections iv). Systemic Diseases: Severe viral, bacterial or circulatory issues—including conditions like Fowl Cholera or Avian Influenza—often present with swollen heads, eyes, and faces, alongside a blue or purple discoloration of the comb and wattles.
4). The vet has examined the flock and administered an antiviral and an antibiotic to it and taken samples from the coop for testing for an accurate and comprehensive diagnosis. #poultry #chicken #diseases #treatment #health